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4 years ago

6. Solve by Elimination: 4x + y = 7 3x - y = 0

Mathematics

2 answers:

igor_vitrenko [27]4 years ago

8 0

X=1, y=3 see attached photo for steps

Ivan4 years ago

4 0

Answer:

{x,y} = {1,-4}

Step-by-step explanation:

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At a farm, four employees harvest 48 pounds of food over a certain number of hours. Each employee works the number of hours show

valkas [14]

Answer:

The number of pounds of food harvested by each employee is proportional to the number of hours worked

Step-by-step explanation:

4 0

3 years ago

If you know that log5 (2) - log5 (12) = 0, which of the following is false?

garri49 [273]

Answer:

Step-by-step explanation:

A is correct because $log_5(12)$ was added on both sides, which is supported by the Additive Property of Equality

C is correct because the Quotient Property of Logarithms states that $log_bM-log_bN=log_b(\frac{M}{N} )$

so $log_5(x)-log_5(12)=log_5(\frac{x}{12} )$ is correct

D is correct because using the fact that $log_5x=log_512$ it is easy to figure out that x=12

For B, there is no property supporting that statement.

8 0

3 years ago

-3x(7x-4)+6x-(13-24x²)

Margarita [4]

Answer:

$3x^2+18x-13.$

Step-by-step explanation:

Step 1:

Equation should be:

$((0-(3x*(7x-4)))+6)-(13-(2^3*3x^2))$

Step 2:

Equation should be:

$((0-3x*(7x-4))+6x)-(13-24x^2)$

Step 3:

Factoring $3x^2+18x-13$
The first term is $3x^2$ . It's coefficient is 3.
The middle term is +18x, it's coefficient is 18.
The last term, "the constant", is -13.

Step 1:

Multiply the coefficient of the first term by the constant 3 * -13 = -39

Step 2:

Find two factors of -39 whose sum equals the coefficient of the middle term, which is 18 .
-39 + 1 = -38
-13 + 3 = -10
-3 + 13 = 10
-1 + 39 = 38
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored

Solution:

$3x^2 + 18x - 13$ .

5 0

2 years ago

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Sally earns graduated commission on her sales each month. She earns 6% commission on the first $45,000 in sales and 8% on anythi

Allisa [31]

The answer is B, because 0.06*45000 + 0.08(51000-45000) = 3,180

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3 years ago

Which of the following expressions represents "twelve diminished by six times a number"?

ahrayia [7]

Diminished means "made smaller", so in other words, subtracted. This makes the phrase "twelve subtracted by six times a number", or more simply "twelve minus six times a number".

Answer:
A. 12 - 6n

4 0

3 years ago

Read 2 more answers